Instructions: Combine chili powder, onion powder, garlic powder, cumin and salt. Rub pork with mixture; likely you will have some spice rub left to use another time.

Heat oven to 200 degrees. Heat a large skillet and add 2 tablespoons of oil. When oil begins to smoke, add pork and sear meat for 3-4 minutes on each side. Remove from heat and place in a large roasting pan. Add tomatoes, cilantro, chipotles in sauce and garlic cloves to pan. Add lemon and lime juice to pan, then add enough oil to cover 3/4 of the meat. Cover pan with foil; bake for at least 6 hours. When done, pork should fall apart.

Remove pork from oil mixture and place on sheet pan with parchment paper to absorb some of the grease.